PetSafe Wireless Fence Pet Containment Systems ADD UNLIMITED PETS: All your pets can use your Wireless Fence System; simply purchase a Receiver Collar for each additional pet WATERPROOF: Safe and effective in the rain or even when swimming; submersible up to 5 ft. in water 5 LEVELS OF CORRECTION: Adjust static correction levels to fit your pet's personality or use tone only mode for training ADJUSTABLE COLLAR: Suitable for pets over 8 lb.; sturdy nylon collar adjusts for neck sizes 6 - 28 in. around; smooth contact points rest gently against your pet's skin to deliver correction when needed ALSO INCLUDED: One waterproof RFA-67D battery, a handy test light tool for testing your collar, and an additional longer set of contact points for pets with thick fur CROSS-COMPATIBLE: This Receiver Collar is also compatible with the PetSafe Free To Roam and PetSafe Stay + Play Wireless Fence Systems; NOT compatible with PetSafe In-Ground Fences or Remote Trainers. HERE TO HELP: Call, email, or chat with our expert U.S.-based customer care specialists Monday through Saturday at 1-800-845-3274 or ccc3@petsafe.net; they are ready to assist you and your pet MANUFACTURER'S WARRANTY: Only valid when purchased from an authorized retailer The transmitter located in the center of your chosen circular area sends a constant signal to the receiver collar worn by your pet. When signal is lost because your pet is approaching the boundary, the collar will give him an audible warning. If your pet continues to leave the area, he will receive a correction to notify him to turn safely back towards home. Use safe and effective correction to teach your pet his boundaries outdoors Adjust the correction levels to suit your pet's unique personality Choose from 5 levels of static correction plus tone-only mode Smooth contact points rest against your pet's skin Additional contact points are included for pets with long hair or thick fur Receiver Collar is waterproof and submersible up to 5 ft. Safe and effective in the rain, snow, and even while swimming Collar and batteries are specially designed to resist the elements One waterproof  RFA-67D battery is included Battery life averages 1 - 3 months depending on pet behavior Replacement batteries available for purchase Low-battery indicator light helps you track battery life To provide assistance with any setup, training, and troubleshooting needs To answer questions about parts and product compatibility